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The NAC transcription factor LuNAC61 negatively regulates fiber development in flax (Linum usitatissimum L.)

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Journal of Integrative Agriculture 2024年第3期23卷 795-805页

作者： Dongwei Xie Jing Li Wan Li lijun Sun Zhigang Dai Wenzhi Zhou Jianguang Su Jian Sun School of Life Sciences Nantong UniversityNantong 226019China Institute of Crop Cultivation and Tillage Heilongjiang Academy of Agricultural SciencesHarbin 150086China Institute of Bast Fiber Crops Chinese Academy of Agricultural SciencesChangsha 410221China Jiangsu Sanshu Biotechnology Co.Ltd. Nantong 226001China

Flax is a crucial fiber crop that exhibits excellent textile properties and serves as a model plant for investigating phloem fiber development. The regulation of multiple genes significantly influences fiber development, notably involving NAC(NAM, ATAF1/2, CUC2) transcription factors in forming the fiber secondary cell wall(SCW).Overexpression of LuNAC61 in flax resulted in sparse top meristematic zone leaves and significantly reduced stem cellulose content. Scanning electron microscopy and staining observations revealed a significant reduction in fiber bundles. β-Glucuronidase(GUS) staining analysis demonstrated high activity of the LuNAC61 promoter in the bast fibers of the flax stem. Additionally, several members of the LuPLATZ and LuCesA families exhibited significant coexpression with LuNAC61. Subcellular localization indicated the presence of LuPLATZ24 protein in the nucleus and cytoplasm, LuNAC61 protein exclusively in the nucleus, and LuCesA10 in the nucleus and endoplasmic reticulum. LuPLATZ24 positively regulates LuNAC61, whereas LuNAC61 negatively affects LuCesA10, suggesting the involvement of a metabolic network in regulating flax fiber development. In conclusion, this study provides a critical opportunity for a comprehensive and in-depth analysis of the mechanisms governing flax fiber development and the potential use of biotechnology to enhance flax fiber yield.

关键词： flax fiber development Lu NAC61 gene function gene interaction

RNA ac^(4)C modification in cancer biology:from regulatory mechanisms to clinical applications

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Science China(Life Sciences) 2024年第4期67卷 832-835页

作者： lijun Tao Yunqing Lu Zhuojia Chen Lichen Ge Junming He Jianxin Peng Hongsheng Wang School of Pharmaceutical Sciences Sun Yat-sen UniversityGuangzhou 510006China Sun Yat-sen University Cancer Center State Key Laboratory of Oncology in South ChinaCollaborative Innovation Center for Cancer MedicineGuangzhou 510060China Department of Hepatobiliary Surgery Guangdong Province Traditional Chinese Medical HospitalGuangzhou 510120China

RNA modifications are increasingly recognized for their significance in diverse physiological and pathological processes,with over 170 types of chemical modifications having been discovered since *** these modifications,N4-acetylcytidine(ac^(4)C)is the first acetylated modification identified on eukaryotic RNAs,previously reported in transfer RNA(t RNA)and ribosomal RNA(rRNA)。

关键词： clinical (4) modification

Hydrothermally stable metal oxide-zeolite composite catalysts for low-temperature NO_(x) reduction with improved N_(2) selectivity

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Chinese Chemical Letters 2024年第6期35卷 515-523页

作者： lijun Yan Shiqi Chen Penglu Wang Xiangyu Liu Lupeng Han Tingting Yan Yuejin Li Dengsong Zhang School of Environmental and Chemical Engineering International Joint Laboratory of Catalytic ChemistryCollege of SciencesShanghai UniversityShanghai 200444China BASF Environmental Catalyst and Metal Solutions IselinNJ 08830United States

Development of hydrothermally stable,low-temperature catalysts for controlling nitrogen oxides emissions from mobile sources remains an urgent *** have prepared a metal oxide-zeolite composite catalyst by depositing Mn active species on a mixture support of CeO_(2)/Al_(2)O_(3) and *** composite catalyst is hydrothermally stable and shows improved low-temperature SCR activity and significantly reduced N_(2)O formation than the corresponding metal oxide *** with a Cu-CHA catalyst,the composite catalyst has a faster response to NH_(3) injection and less NH_(3) *** characterization results reveal that such an oxide-zeolite composite catalyst contains more acidic sites and Mn^(3+)species as a result of oxide-zeolite interaction,and this interaction leads to the generation of more NH_(4)^(+)species bound to the Br?nsted acid sites and more reactive NOxspecies absorbed on the Mn ***,we report our mechanistic understanding of the oxide-zeolite composite catalyst and its molecular pathway for improving the low-temperature activity and N_(2) selectivity for NH_(3)-SCR ***,this work may provide an alternative methodology for low-temperature NO_(x) control from diesel vehicles.

关键词： Selective catalytic reduction Mn-based catalysts Hydrothermal stability N_(2) selectivity

Cucurbit[n]uril-based nanostructure construction and modification

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Chinese Chemical Letters 2024年第8期35卷 138-148页

作者： lijun Mao Shuo Li Xin Zhang Zhan-Ting Li Da Ma School of Pharmaceutical Engineering&Institute for Advanced Studies Taizhou UniversityJiaojiang 318000China Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules Shanghai Institute of Organic ChemistryChinese Academy of SciencesShanghai 200032China Department of Chemistry Shanghai Key Laboratory of Molecular Catalysis and Innovative MaterialsFudan UniversityShanghai 200438China

New fabrication method of nanostructures is of great importance for the applications of nanoscience and *** review summarizes cucurbit[n]uril(CB[n])-based nanostructure fabrication and modification *** strategies include the use of CB[n]s as building blocks and supramolecular crosslinkers to fabricate nanostructures,to surface modify nanostructures,and as gatekeepers to control the release of encapsulated *** nanostructures are used for drug delivery,bioimaging,chemical sensing,catalysis and other ***[n]s often play a vital role in the fabrication of these nanos-tructures,and the realization of the applications.

关键词： Cucurbit[n]uril Nanostructure Host-guest interaction Nanofabrication

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潜山裂缝型凝析气藏注气开发机理

天然气地球科学 2024年第2期35卷 357-365页

作者：张利军赵林谭先红海洋油气高效开发全国重点实验室北京100027 中海油研究总院有限责任公司北京100027

为指导潜山裂缝型凝析气藏的有效开发,分别开展长岩心注气实验及纵向剖面模型注气实验,从驱油效率及纵向波及程度两方面深入认识潜山裂缝型凝析气藏注气开发机理。研究表明,对于衰竭开发,裂缝储层凝析油采出程度在前期(>32 MPa)高于无... 详细信息

为指导潜山裂缝型凝析气藏的有效开发,分别开展长岩心注气实验及纵向剖面模型注气实验,从驱油效率及纵向波及程度两方面深入认识潜山裂缝型凝析气藏注气开发机理。研究表明,对于衰竭开发,裂缝储层凝析油采出程度在前期(>32 MPa)高于无裂缝均质储层,但中后期(<32 MPa)低于无裂缝均质储层。在最大反凝析液压力(23 MPa)和废弃压力(5 MPa)下,裂缝使采出程度分别降低1.37%和4.77%。在最大反凝析液压力下注气,均质储层的凝析油采出程度提高20%,且与渗透率关系不大;受气窜影响,裂缝储层的凝析油采出程度仅提高13.7%。注气过程中,裂缝储层的气油比曲线呈双台阶状上升,拐点分别位于0.4 HCPV、1.4 HCPV,反映了裂缝和基质—裂缝2类气窜通道的形成。凝析油采出程度的增加主要位于注气阶段,后续衰竭阶段相比直接衰竭开发的增加幅度较小。结合注气PVT实验,认为注气提高驱油效率的机理主要为保压和驱替。注气时机方面,无裂缝储层的高压注气效果显著优于低压注气,但对裂缝储层影响不大。对于纵向波及程度,无裂缝储层的隔夹层遮挡对重力分异存在一定的阻碍作用,但重力驱特征整体上较为明显,顶部气驱程度最高;裂缝潜山高角度裂缝发育,阻碍了注入气在注采井间的横向运移,重力驱特征相对较弱,未形成明显低饱和度区,中部气驱程度最高。研究将对潜山裂缝型凝析气藏注气开发方案设计及动态跟踪调整提供有效指导。

关键词：潜山裂缝凝析气藏注气机理重力分异

HyperArc performance in radiotherapy and its correlations with number and volume of multiple brain metastases

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Radiation Medicine and Protection 2024年第2期5卷 139-144页

作者： Hongtao Chen Zihuang Li Guixiang Liao lijun Wang Xiaonian Deng Heli Zhong Department of Radiation Oncology Shenzhen People's HospitalThe Second Clinical Medical CollegeJinan UniversityThe First Affiliated HospitalSouthern University of Science and TechnologyShenzhen518020China

Objective:To assess the performance and advantages of HyperArc for radiotherapy of multiple brain metastases with dosimetric parameters with respect to coplanar volumetric modulated arc radiotherapy(c-VMAT),and characterize implicit correlations between tumor features and dosimetric ***:This retrospective study involved 40 patients with multiple brain metastases(4–16 tumors,12.8–240.8 cm3)who received simultaneous radiotherapy at the Department of Radiation Oncology,Shenzhen People's Hospital from January 2019 to December *** HyperArc and c-VMAT plans were designed by the same and qualified physicist using the Eclipse system with Truebeam.A single isocenter and a 6 MV flattening filter-free(6FFF)photon beam were used for radiotherapy of multiple brain metastases in each *** parameters of tumors and organs at risk(OARs)were compared between HyperArc and c-VMAT ***-lations between tumor features(number and volume)and dosimetric parameters were revealed and ***,monitor units(MUs)of both plan types were recorded to assess rays utilization and delivery ***:Compared to c-VMAT plans,HyperArc plans achieved higher maximum dose(D_(max))(5.23%,t=7.87,P<0.01),but lower minimum dose(Dmin)(3.94%,t=-2.12,P=0.04)and mean dose(D_(mean))(1.05%,t=-3.29,P<0.01)for planning gross tumor volumes(PGTVs).The conformity index(CI),homogeneity index(HI),gradient index(GI)and R50%of PGTVs with HyperArc were better than those with c-VMAT,with the improve-ments of 20.78%,1.68%,19.83%and 36.20%,respectively(P<0.01).The dosimetric parameters of OARs were significantly improved in HyperArc plans compared to c-VMAT ***,the D_(max)and the D_(mean)to the brainstem decreased by 16.14%and 11.37%,*** D_(max)for eye_L decreased by 16.88%,for eye_R decreased by 11.67%,for optical nerve_L decreased by 12.56%,and for chiasm decreased by 18.12%.Few correlations were observed between the differences of CI/HI/GI

关键词： HyperArc Radiotherapy Multiple brain metastases Conformity

Aggregation-induced Emission Probe for Fluorescence/Photoacoustic Dual-modality Imaging and Photodynamic/Photothermal Treatment

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Chemical Research in Chinese Universities 2024年第2期40卷 293-304页

作者： CHEN Peiyu ZHANG Guoyang LI Jiguang MA lijun ZHOU Jiaying ZHU Mingguang LI Shuo WANG Zhuo State Key Laboratory of Chemical Resource Engineering College of ChemistryBeijing Advanced Innovation Center for Soft Matter Science and EngineeringBeijing University of Chemical TechnologyBeijing100029P.R.China

The combination of near-infrared(NIR)fluorescence imaging(FLI)and photoacoustic imaging(PAI)can effectively compensate for each other’s inherent limitations,which can provide reliable and rich information on tumor ***,the development of FL/PA dual-modality imaging probes is beneficial for achieving precision cancer diagnosis and ***,we designed an efficient phototherapy agent methoxy bithiophene indene(OTIC),which was based on aggregation-induced emission(AIE)active *** improve the water dispersion and enrichment of OTIC at the tumor site,OTIC nanoparticles(OTIC NPs)were prepared by a nanoprecipitation *** balance between radiation and non-radiation energy dissipation was regulated by the strong donor-acceptor interaction and intramolecular *** OTIC NPs exhibited bright NIR fluorescence,photoacoustic signals,efficient generation of reactive oxygen species,and high photothermal conversion efficiency under NIR *** imaging of the tumor and mice sentinel lymph nodes(SLNs)with OTIC NPs was visualized by NIR FL/PA dual-modal *** the comprehensive imaging information provided by OTIC NPs in vivo,tumors were ablated under laser irradiation,which greatly improved the therapeutic *** NPs would be possible to realize the precise guidance of FL/PA imaging for tumor treatment in the future clinical application.

关键词： Aggregation-induced emission Dual-modality imaging Photodynamic/photothermal treatment

脉冲超声及电磁场对大鼠骨髓间充质干细胞体外成软骨分化过程中细胞外基质溢出的影响

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华西口腔医学杂志 2016年第3期34卷 291-294页

作者：张智唐娜王珏赵志河谭理军口腔疾病研究国家重点实验室华西口腔医院正畸科(四川大学) 成都610041 四川省人民医院口腔科成都610072

目的研究脉冲超声以及脉冲电磁场对大鼠骨髓间充质干细胞微球体外成软骨分化中细胞外基质向培养基中溢出的影响。方法将干细胞微球在成软骨培养基中进行培养,分为无刺激组(N组)、脉冲超声(100、150、200 mW·cm^(-2))刺激组和脉冲电磁... 详细信息

目的研究脉冲超声以及脉冲电磁场对大鼠骨髓间充质干细胞微球体外成软骨分化中细胞外基质向培养基中溢出的影响。方法将干细胞微球在成软骨培养基中进行培养,分为无刺激组(N组)、脉冲超声(100、150、200 mW·cm^(-2))刺激组和脉冲电磁场(1、2、5 mT)刺激组。2周后采用酶联免疫吸附测定法检测培养液中Ⅱ型胶原和糖胺聚糖的质量浓度。结果脉冲超声刺激组细胞外基质分泌较N组增多(P0.05);脉冲电磁场组对Ⅱ型胶原分泌无明显影响(P>0.05),1 mT组对糖胺聚糖的分泌无明显影响(P>0.05),2 mT和5 mT组糖胺聚糖的分泌减少(P<0.05)。结论在促进干细胞成软骨分化的过程中,特定参数的脉冲电磁场可能起到防止增多的细胞外基质向组织外扩散溢出的作用。

关键词：脉冲超声脉冲电磁场成软骨分化细胞外基质

Epidemiological characteristics of centenarian deaths in China during 2013-2020:A trend and subnational analysis

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Chinese Medical Journal 2024年第13期137卷 1544-1552页

作者： Fan Mao Weiwei Zhang Peng Yin lijun Wang Jinling You Jiangmei Liu Yunning Liu Maigeng Zhou National Center for Chronic and Non-Communicable Disease Control and Prevention Chinese Center for Disease Control and PreventionBeijing 100050China

Background:Studies that comprehensively address the characteristics of centenarian deaths are *** present study aimed to depict the characteristics of centenarian deaths in China and their changing ***:Data on centenarian deaths between 2013 and 2020 were obtained from the national mortality surveillance system of China,including date,place of death(PoD),and underlying cause of death(CoD).Descriptive analyses were performed to understand the epidemiological characteristics,and a joinpoint regression model was adopted to examine the changing trends in the proportions of different PoDs,CoDs among centenarians,and centenarian deaths accounting for all deaths and deaths among people aged 65 years and ***:There were 46,938 registered centenarian deaths between 2013 and 2020 that included 34,311 females(73.10%)and 12,627 males(26.90%).January(12.05%),February(9.99%),and December(9.74%)were the top three months with the highest number of *** proportions of deaths that occurred in homes,hospitals,and nursing homes were 81.71%,13.63%,and 2.68%,*** proportion of deaths in nursing homes increased by 9.60%(95%confidence intervals[CIs],6.4-12.9%)from 2014 to *** disease(35.72%)was the leading cause of death,followed by respiratory diseases(17.63%),cerebrovascular disease(15.60%),and old age(11.22%).The proportion of respiratory diseases decreased by 4.8%(95%CI,-8.8 to-0.7%),and the proportion of deaths from old age decreased by 2.3%(95%CI,-4.4 to-0.1%)per *** had the highest proportions of deaths in hospitals(39.38%)and nursing homes(14.68%).Sichuan had the highest proportion of deaths attributed to respiratory diseases(32.30%),while Jiangsu(26.58%)and Zhejiang(23.61%)had the highest proportions of deaths from old ***:Unlike other countries,centenarian deaths in China are characterized by a higher proportion of home and heart disease deaths,and this death pattern differs across provinces.

关键词： Centenarians Death Aging Cardiovascular diseases Respiratory tract diseases Place of death Cause of death